They’re croppable and can be layered above or below other objects on a slide. Video objects can be added to individual slides as regular objects, which means they can appear and disappear across slides and be a part of transitions between slides.
Your mileage may vary, but my favorite updates are in Keynote, which has added support for live video on slides-from cameras or (on the Mac) from device screen captures. On Tuesday Apple released version 11.2 of its iWork app suite, featuring new versions of Keynote, Pages, and Numbers. You’ll need to bring your own device frames, though. Keynote will let you place live camera (left) and device screen capture (right, Mac only) on slides as standard objects. IWork comes alive with Keynote live-video features
